/*
 *      cook - file construction tool
 *      Copyright (C) 1997, 1999, 2001, 2006, 2007 Peter Miller;
 *      All rights reserved.
 *
 *      This program is free software; you can redistribute it and/or modify
 *      it under the terms of the GNU General Public License as published by
 *      the Free Software Foundation; either version 2 of the License, or
 *      (at your option) any later version.
 *
 *      This program is distributed in the hope that it will be useful,
 *      but WITHOUT ANY WARRANTY; without even the implied warranty of
 *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *      GNU General Public License for more details.
 *
 *      You should have received a copy of the GNU General Public License
 *      along with this program; if not, write to the Free Software
 *      Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
 *
 * MANIFEST: functions to quit the program
 */

#include <common/ac/stdlib.h>

#include <common/quit.h>
#include <common/star.h>


static quit_ty  quit_list_prio[4];
static size_t   quit_list_prio_length;

static quit_ty  quit_list[32];
static size_t   quit_list_length;


/*
 * NAME
 *      quit_handler
 *
 * SYNOPSIS
 *      int quit_handler(quit_ty);
 *
 * DESCRIPTION
 *      The quit_handler function registers the function pointed to by func,
 *      to be called without arguments at normal program termination.
 */

void
quit_handler(quit_ty f)
{
    /* assert(quit_list_length < SIZEOF(quit_list)); */
    if (quit_list_length < SIZEOF(quit_list))
        quit_list[quit_list_length++] = f;
}

void
quit_handler_prio(quit_ty f)
{
    /* assert(quit_list_prio_length < SIZEOF(quit_list)); */
    if (quit_list_prio_length < SIZEOF(quit_list))
        quit_list_prio[quit_list_prio_length++] = f;
}


/*
 * NAME
 *      quit - leave program
 *
 * SYNOPSIS
 *      void quit(int status);
 *
 * DESCRIPTION
 *      The quit function causes normal program termination to occur.
 *
 *      First, all functions registered by the quit_handler function are
 *      called, in the reverse order of their registration.
 *
 *      Next, the program is terminated using the exit() function.
 *
 * CAVEAT
 *      The quit function never returns to its caller.
 */

void
quit(int n)
{
    star_eoln();
    while (quit_list_prio_length > 0)
        (*quit_list_prio[--quit_list_prio_length]) ();
    while (quit_list_length > 0)
        (*quit_list[--quit_list_length]) ();
    exit(n);
}